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<title>xử lý String</title>
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<body><EM><FONT face=Arial color=#666666>&lt;? php<BR>$ 
txt1 = “Xin chào thế giới”;<BR>$ txt2 = “1234″;<BR>echo $ txt1. “”. $ 
txt2;<BR>?&gt;</FONT></EM></body>
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